The primary task of a rezzer in an instance is to restore dead fellow group members to life, but they must choose the order and priority carefully depending on their type of skill. Primary classes have the ability to rez the whole party (or raid) in a relatively short time (if at the cost of lots of mana) whereas secondary rezzers tend to enhance wipe protection by using their abilities on any primary rezzers or carefully deciding who to target first. The best rezzer class is controversial, but this guide should help understand best how, why, and when to rez for instance situations.